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10+ MicroPack Interview Questions and Answers

Updated 25 Sep 2024
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Q1. What is difference between Docker and Virtual Machine?

Ans.

Docker is a containerization platform while Virtual Machine is a virtualization platform.

  • Docker shares the host OS kernel while VM has its own OS.

  • Docker is lightweight and faster to start than VM.

  • Docker containers are portable and can run on any system with Docker installed.

  • VMs are more secure as they provide complete isolation from the host system.

  • Docker is ideal for microservices architecture while VMs are better for running multiple applications with different OS requireme...read more

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Q2. What is String Pool? Why Strings are called immutable?

Ans.

String Pool is a cache of String objects. Strings are immutable because their values cannot be changed once created.

  • String Pool is a memory area where Java stores String objects to save memory.

  • When a new String is created, Java first checks if it already exists in the String Pool. If it does, it returns a reference to the existing object instead of creating a new one.

  • Strings are immutable because any operation that modifies a String actually creates a new String object rather...read more

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Q3. What are some ways to optimize SQL Query?

Ans.

Optimizing SQL queries can improve performance and reduce resource usage.

  • Use indexes to speed up data retrieval

  • Avoid using SELECT * and instead specify only required columns

  • Use JOINs instead of subqueries

  • Avoid using functions in WHERE clauses

  • Use UNION ALL instead of UNION if possible

  • Avoid using temporary tables

  • Use EXPLAIN to analyze query performance

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Q4. What does ADP do? What is it's domain?

Ans.

ADP is a global provider of cloud-based human capital management solutions that streamline HR, payroll, talent, time, tax and benefits administration.

  • ADP provides software and services related to human resource management, payroll processing, tax compliance, and benefits administration

  • It offers cloud-based solutions for businesses of all sizes

  • ADP's domain is human capital management

  • It serves clients in over 140 countries worldwide

  • Some of its popular products include ADP Workf...read more

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Q5. What are functional interfaces and one example.

Ans.

Functional interfaces are interfaces with only one abstract method. Example: java.util.function.Consumer

  • Functional interfaces are used in lambda expressions and method references

  • They provide a way to pass behavior as an argument to a method

  • Examples include java.util.function.Predicate, java.util.function.Supplier

  • Functional interfaces can also have default and static methods

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Q6. Advantages of Linked List over Array List?

Ans.

Linked List allows dynamic size, efficient insertion/deletion, while Array List has faster access and better cache locality.

  • Linked List can grow or shrink dynamically, while Array List has fixed size.

  • Insertion and deletion are faster in Linked List as it requires only changing pointers, while Array List requires shifting elements.

  • Linked List has better memory utilization as it only allocates memory when needed, while Array List pre-allocates memory.

  • Array List has faster acces...read more

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Q7. What is an API and explain in simple terms

Ans.

An API is a set of rules and protocols that allows different software applications to communicate with each other.

  • API stands for Application Programming Interface

  • It defines the methods and data formats that applications can use to request and exchange information

  • APIs can be used to access services or data from other applications or platforms

  • Examples include Google Maps API for integrating maps into a website, Twitter API for accessing tweets, and Spotify API for music streami...read more

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Q8. How web works and high level view

Ans.

The web works by using a client-server model where clients request and receive information from servers via the internet.

  • Clients (such as web browsers) send requests for web pages or resources to servers

  • Servers process these requests and send back the requested information

  • HTTP (Hypertext Transfer Protocol) is commonly used for communication between clients and servers

  • Web pages are typically written in HTML (Hypertext Markup Language) and styled with CSS (Cascading Style Sheet...read more

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Q9. Types of OSI models we have in CN

Ans.

There are 7 layers in the OSI model: Physical, Data Link, Network, Transport, Session, Presentation, and Application.

  • Physical layer deals with physical connections and signals

  • Data Link layer handles error detection and correction

  • Network layer routes data between different networks

  • Transport layer ensures data delivery and error checking

  • Session layer establishes, maintains, and terminates connections

  • Presentation layer translates data into a format that the application layer can...read more

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Q10. Find the largest string in a given array

Ans.

Find the largest string in a given array of strings

  • Iterate through the array and compare the length of each string to find the largest one

  • Use a variable to keep track of the largest string found so far

  • Return the largest string at the end

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Q11. Most used technologies during work

Ans.

The most used technologies during work include Java, Spring Boot, AWS, Docker, and Kubernetes.

  • Java

  • Spring Boot

  • AWS

  • Docker

  • Kubernetes

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Q12. Explain Redux concept

Ans.

Redux is a predictable state container for JavaScript apps.

  • Redux is a state management library for JavaScript applications.

  • It helps in managing the state of an application in a predictable way.

  • Redux stores the entire state of an application in a single immutable object.

  • Actions are dispatched to update the state in Redux.

  • Reducers specify how the state should change in response to an action.

  • Redux is commonly used with React to manage the state of React components.

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Q13. Explain the framework

Ans.

A framework is a structure that provides guidelines, best practices, and reusable components for developing software applications.

  • Framework helps in organizing code and promoting code reusability.

  • It provides a set of libraries, tools, and APIs to facilitate development.

  • Frameworks can be front-end (e.g. React, Angular) or back-end (e.g. Spring, Django).

  • Examples of frameworks include Ruby on Rails, Laravel, and .NET Framework.

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